Pressure-gage.



A. 0. BENEG'KE.

PRESSURE GAGE.

APPLICATION FILED 00.T.8, 1910.

1,070,392,, Patented Aug. 19,1913.

2 SHEETS-SHEET 1.

w/r/vmsm- IIVI/E% 3. QWMQ m ATTORNEY A. O. BENECKE.

PRESSURE GAGE.

APPLICATION FILED 00m, 1910.

v IIVI/E/VTO 14 TTOR/I/ Y Patented Aug. 19, 1913.

2 SHEETS-SHEET 2.

. TED s'rnrns PAT 'QFFTQTE.

ADELBERT o. nnnnorrn, or roxrono, MASSACHUSETTS.

PRESSURE-GAGE.

Specification of Letters Patent.

Patented Aug. 1%,11913.

Application filed October 8, 1910. Serial No. 585,923.

To all whom it may concern a citizen of the United and usefulImprovements and exact description, others skilled-in the art to whichit pertalns to make, construct, and use the same, referdrawings, and toletters of reference marked i thereon, forming a part of thisspecification. invention relates to pressure gages ence being had to theaccompanying employing a Bourdon-tube sprlng and more particularly tothe means employed whereby the-movement, of the free end of thetubespring is transmitted to the multiplying and terminal, in whichslides a pin adjustably seindicating member of the gage.

Heretofore in sure gages of the type to to the Bourdon-tube spring by alink, in such a manner y the same is connected Bourdon-tube spring. Suchthe link which is from the path described the link which is connected tothe member multiplying device tha of the indexing mechanism; and thatfurthermore, the plane in which the free end of the Bourdon-tube springmoves, can hardly be expected to be perpendicular to the axis of saidmember.

My invention has for its object, to provide a pressure gage which is notopen to the objections above referred to, and I accomplish my object byso arranging the entlylo'f the Bourdonrtube spring, except that theposition of the free end of the the construction of preswhich myinvention relates, it has been customary to conj nect a member of the,indexing mechanism; pivoted that the movement of this member, in eitherdirection, is caused a direct push or pull of the link by which 1 to thefree end of the .an arrangei ment introduces a great deal of frictionand j lost motion, seriously interfering with the I connected to thefree end of the Bourdon-tube spring is quite difierent by that pointofsion of the hair-spring it works independ- I spring determines theextent of travel of the The shaft which carries the pointer pointer. isactuated upon by a hair-spring or any other suitable device, in such amanner that it tends to revolve in one direction, thus turning a sectorof a gear wheel or a lever until an arm connected to the same comes incontact with the free end of the the Bourdon-tube spring.

A preferred construction of a pressure gage embodying my invention isshown in the accompanying drawings, in which-- Figure 1 represents afront elevation of a pressure gage, the movement supporting bracketbeing removed toshow the mechanism. Fig. 2 represents a fragmentary viewof the free end of'the Bourdontube spring having secured thereto aslotted curedto an arm of the multiplylng and indexing mechanism; andFig. 3 represents a front elevation of a modified form of my improvedpressure gage, the movement supporting bracket being removed to show themechanism.

Similar letters of reference refer to like parts throughout thespecification and drawings.

The Bourdon-tube spring a has its inner end aflixed to the socket b, andto its free outer end is attached a suitable terminal a. The sector 61pivoted at d together with the pinion e constitutes the multiplyingdevice secured in any convenient manner to a movement supporting bracketcommon in pressure gages (not shown), and has preferably an integral arm1 extending therefrom,

to which is adjustably secured the pin 9 which bears against and hasslidin engagement with the terminal 0 without %eing in any way connectedto the same. The ten h which actuates the pinion e and pointer i tendsto hold the pin 9 against the terminal 0, which pin thus follows themovement of the terminal 0 and transmits the same to the pointer 2'which moves over the scale j.

Inasmuch as the pin g is made to slide on and is therefore adjustablealong the arm f, the motion of the terminal a may be r link. Such resultwill .made with scales not exceeding 90 more or less multiplied, thuslengthening or shortening the scale 1'. I prefer to .provide theterminal 0 with a slotk, as illustrated in Fig. 2, in which the pin 9 isloosely fitted, thus preventing the'pointer i from oscillating throughcase of large and sudden changes in pressure.

In Fig. 3 of the drawings, I have shown a modified form of my improvedpressure gage, the operation and principle of which is identical withthe structure shown in Fig. 1, with the exception that instead ofemploying a sector and a pinion, I substitute therefor'levers. Gages aresometimes in angle, and in such instruments, I find it desirable toemploy .the construction shown in Fig. 3, in which a represents theBourdon-tube spring having its inner "end aflixed to the socket b, andto its free outer end is attached the terminal 0. Instead of employingthe sector al'and the pinion e, l substitute therefor the lever (Z andthe lever e. The hair spring k tends to move the pointer z" in thedirection indicated by the arrow, owing to the fact that the lever 6moves with and is secured to the pointer 11', there by causing the levere to contact with the lever d at its upper end, moving it in thedirection indicated by the arrow and turning it around the pivot (Zkeeping the adjustable pin located on the extension f of the lever incontact with the terminal 0 of the Bourdon-tube spring, until pressureis applied to the Bourdon-tube spring, in which case, the same opens,and the index i will travel over the scale 3" with the adjustable pin gin contact with the terminal c.

The present invention simple and exceedingly gage, the specific featureof which differs from all others in the arrangement of the multiplyingmechanism, in that it is not rigidly connected to the Bourdon-tubespring, and therefore works independently of the same, and that theposition of the free end of the spring determines the extent of thetravel of the pointer, thereby reducing friction and lost motion to aminimum.

It will be readily understood that in case provides a very eflio1entpressure the Bourdon-tube spring does not move in a plane exactlyperpendicularly torthe axis of the sector, bearings of the sector shaftwill result when the sector is connected in the customary way to theBourdon-tube spring by a pivoted notice the case in my construction,

- the arm of the sector can freely move in the slot of the springterminal, and held in contact on one and the of the slot by is always Lsame side the actlon of the hair spring.

too wide an angle, in

considerable friction in the' as the contact pin attached to presentinvention; hence I do not wish to be limited to the exact arrangementsof the parts herein shown and described, as obvious modifications willsuggest themselves to those skilled in the art.

I believe that I am the first to use a multiplying device which is in noway connected to the measuring spring, and therefore desire to claim itbroadly.

I claim:

1. In a premure gage, the combination of a Bourdon-tube provided with aterminal having a flat face extending transversely of said tube, andmultiplying mechanism comprising a sector provided with adjustable meansadapted to be adjusted transversely of said tube across the face of saidterminal, said adjustable means resting against and adapted to beoperated by the terminal of said tube to move said sector.

2. In a pressure gage, the combination of I a Bourdon-tube provided witha terminal having a flat face extending transversely of said tube, aspring-actuated pinion wheel and pointer, a sector havi g teeth on itsperiphery engaging said PlIllOIl and adjust able means carried by saidsector and engaging the flat face of the terminal of said tube, wherebymovement of said terminal determines the travel of the pointer.

3. In a pressure gage, the combination of a Bourdon-tube provided with aterminal having a flat face extending transversely of said tube, apointer, a spring for turning said pointer in one direction, amultiplying sector adapted tube, for turning said pointer in the oppo-site direction and winding up said sprin and adjustable meansconnected to sai sector and in sliding contact with the flat face of theterminal of said tube for transmitting the movements of said tube tosaid pointer.

4:. In a pressure gage, the combination of a Bourdon-tube provided witha terminal having a flat face extending transversely of said tube, apointer, a spring adapted to turn said pointer in one direction, amultiplying sector operatively connected to said pomter and providedwith an arm extending past the terminal of said tube and an adjust-ablemember on said arm adapted to said tube, so that movement of the latterin one direction will move said pointer in the opposite direction to theaction of said spring.

a Bourdon-tube provided with a slotted terminal, the flat faces of whichextend transcontact with the flat face of the terminal of I 5. In apressure gage, the combination of ma am versely of said tube, a pointer,a spring for slotted terminal for transmitting the move turning saidpointer in one direction, a mu].- ment of said tube to said pointe 0 1otiplying sector adapted to be turned by said This specification signedand witnessed tube for turning said pointer in the opposite this 6th dayof October, 1910.

direction and winding up said sprmg and ADELBERT O. BENEGKE. an armextending from said sector provided Witnesses: with an adjustable memberadapted to con- CLAUDE E. BEZANSON,

tact with the faces of and slide in said CHAs. 1E. Summon.

